WO1996027105A1 - Pencil type glow plug for diesel engines - Google Patents

Pencil type glow plug for diesel engines Download PDF

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Publication number
WO1996027105A1
WO1996027105A1 PCT/DE1996/000144 DE9600144W WO9627105A1 WO 1996027105 A1 WO1996027105 A1 WO 1996027105A1 DE 9600144 W DE9600144 W DE 9600144W WO 9627105 A1 WO9627105 A1 WO 9627105A1
Authority
WO
WIPO (PCT)
Prior art keywords
heating device
cylindrical metal
glow plug
metal tube
ceramic heating
Prior art date
Application number
PCT/DE1996/000144
Other languages
German (de)
French (fr)
Inventor
Johannes Locher
Albrecht Geissinger
Werner Teschner
Horst BÖDER
Jürgen OBERLE
Karl-Heinz Heussner
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO1996027105A1 publication Critical patent/WO1996027105A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
    • F23Q7/001—Glowing plugs for internal-combustion engines

Definitions

  • the invention relates to a glow plug for diesel engines with a ceramic heating device according to the preamble of the main claim.
  • a glow plug is already known from DE-OS 38 37 128, in which a ceramic heating device is held by the tip of a cylindrical holder.
  • the ceramic heating device consists of a U-shaped heating section and two lines which extend from the two ends of the U-shaped heating section to the rear for contacting.
  • a voltage is applied to the two lines in such a way that a current flows from one end of the U-shaped heating section via the U-shaped heating section to the other end of the U-shaped heating section.
  • the U-shaped heating section is electrically insulated from the cylindrical holder that surrounds it.
  • the glow plug according to the invention with the characterizing features of the main claim has the advantage that the number of electrical leads can be reduced by ground contact of the ceramic Bankab ⁇ section over the cylindrical metal tube. This results in a simpler and cheaper production.
  • the second contacting in the tip of the ceramic heating device on the combustion chamber side ensures that the current flows through this tip on the combustion chamber side, thus ensuring good mixture access and thus heating of the fuel mixture.
  • the electrical supply line to the tip of the ceramic heating element does not consist of a flexible electrical line, but that the connecting bolt, which is connected outside the combustion chamber to the supply voltage, such as the battery of the motor vehicle, directly on a central supply line of the heating element or is connected to the closed bottom of the ceramic heating element.
  • the connecting bolt which is connected outside the combustion chamber to the supply voltage, such as the battery of the motor vehicle, directly on a central supply line of the heating element or is connected to the closed bottom of the ceramic heating element.
  • FIG. 1 shows a first exemplary embodiment of the invention
  • FIG. 2 shows a second exemplary embodiment of the invention
  • FIG. 3 shows a third exemplary embodiment with contacting via the connecting bolt
  • FIG. 4 shows a fourth exemplary embodiment of the invention with contacting of the connecting bolt
  • FIG. 5 shows a fifth exemplary embodiment of the Invention with a change of control within the ceramic heater.
  • FIG. 1 shows a longitudinal section through a first embodiment of the invention.
  • the glow plug here consists of a cylindrical metal tube 1.
  • This cylindrical metal tube 1 represents the housing of the glow plug and serves for screwing into the engine block by means of a thread 2 on the outside.
  • the cylindrical metal tube also serves as a holder for the glow plug 3, which protrudes into the combustion chamber and heats the fuel mixture for faster self-ignition during the glow process.
  • a ceramic heating device 4 is thus introduced into a tip of the cylindrical metal tube 1.
  • the housing 1 is screwed into the engine block (not shown) of an internal combustion engine such that the end of the ceramic heating device 4 projects into a combustion chamber of the internal combustion engine in a self-supporting state.
  • the ceramic heater 4 consists of an electrically conductive ceramic, which has the shape of a sleeve closed on one side. The side of the sleeve remote from the holder is closed on the bottom.
  • the ceramic heating device 4 is fitted into the housing 1 in such a way that an electrical connection is established between the outer lateral surface of the ceramic heating device 4 and the inner wall of the cylindrical metal tube 1.
  • a connecting bolt 5 projects into the cylindrical metal tube. This connecting pin 5 is electrically isolated from the cylindrical metal tube 1 by means of an insulating ring 6.
  • the connecting bolt 5 is contacted with the supply voltage, for example of the battery, not shown, of a motor vehicle.
  • FIG. 2 shows a second embodiment.
  • the basic structure of the glow plug of FIG. 2 corresponds to the structural design of FIG. 1, which is why the individual details are provided with the same reference numerals and the same structure for the same parts is not to be explained again.
  • the ceramic heating device in FIG. 1 corresponds to the structural design of FIG. 1, which is why the individual details are provided with the same reference numerals and the same structure for the same parts is not to be explained again.
  • the ceramic heating device 3 has a rod shape which has an annular recess 10, so that the ceramic heating device has a concentric core 9.
  • the rotationally symmetrical longitudinal axes of the rod-shaped ceramic heating device, the annular recess and the concentric core are congruent.
  • the annular recess 8 extends over the entire length of the ceramic heating device in such a way that the ceramic heating device 3 has a closed bottom on the combustion chamber side.
  • the concentric core 9 also extends over the entire length of the ceramic heating device 3, so that, in contrast to FIG. 1, the electrical wire 7 contacted on the connecting bolt 5 only reaches up to the concentric core 9.
  • the feed line 7 is thus considerably shorter than, for example, the feed line in FIG. 1, which results in a lower load on the very thin feed wire.
  • the cavity in the cylindrical metal tube 1 can optionally be filled with an electrically insulating ceramic powder.
  • FIG. 2 shows an exemplary embodiment which essentially corresponds to FIG. 2. The only difference from FIG. 2 is that the connecting bolt 5 is brought right up to the concentric core 9 of the ceramic heating device 3. In this embodiment, the electrical lead wire is completely eliminated.
  • FIG. 4 shows a fourth embodiment which essentially corresponds to the exemplary embodiment in FIG. 3. The only difference is that the connecting bolt 5 is extended here, based on FIG. 3, to such an extent that it extends to the closed bottom of the ceramic heating device 3.
  • the current flows through the tip of the ceramic heating device 3 remote from the holder.
  • contact is made with the positive pole of the supply voltage via the connecting bolts and optionally an electrical supply line on the closed bottom of the ceramic heating device. Since the ceramic heating device is electrically contacted on its peripheral surface surrounded by the holder, this ensures that the current flow in any case extends from the tip of the ceramic heating element 3 over the peripheral surface of the ceramic heating device. This ensures that the tip of the ceramic heating device which projects furthest into the combustion chamber glows and the diesel mixture is heated.

Abstract

A pencil type glow plug for diesel engines has a heating ceramic device held by a cylindrical metallic tube, grounded through the cylindrical metallic tube and electrically contacted to the positive pole of the supply voltage at its side away from the holder.

Description

Glühstiftkerze für DieselmotorenGlow plug for diesel engines
Stand der TechnikState of the art
Die Erfindung geht aus von einer Glühkerze für Dieselmotoren mit einer keramischen HeizVorrichtung nach der Gattung des Hauptanspruchs. Es ist schon eine solche Glühkerze aus der DE-OS 38 37 128 bekannt, bei welcher eine keramische Heiz¬ vorrichtung von der Spitze eines zylindrischen Halters ge¬ halten ist. Die keramische Heizvorrichtung besteht dabei aus einem U-förmigen Heizabschnitt und zwei Leitungen, die sich von den beiden Enden des U-förmigen Heizabschnitts zur Kon- taktierung nach hinten erstrecken. Während eines Glühvorgan¬ ges wird an den beiden Leitungen eine Spannung derart ange¬ legt, daß ein Stromfluß von einem Ende des U-förmigen Heiz¬ abschnitts über den U-förmigen Heizabschnitt zum anderen Ende des U-förmigen Heizabschnittes erfolgt. Der U-förmige Heizabschnitt ist dabei gegenüber dem zylindrischen Halter, welcher ihn umgibt, elektrisch isoliert.The invention relates to a glow plug for diesel engines with a ceramic heating device according to the preamble of the main claim. Such a glow plug is already known from DE-OS 38 37 128, in which a ceramic heating device is held by the tip of a cylindrical holder. The ceramic heating device consists of a U-shaped heating section and two lines which extend from the two ends of the U-shaped heating section to the rear for contacting. During a glow process, a voltage is applied to the two lines in such a way that a current flows from one end of the U-shaped heating section via the U-shaped heating section to the other end of the U-shaped heating section. The U-shaped heating section is electrically insulated from the cylindrical holder that surrounds it.
Vorteile der ErfindungAdvantages of the invention
Die erfindungsgemäße Glühstiftkerze mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß durch die Massekontaktierung des keramischen Heizab¬ schnittes über das zylindrische Metallrohr die Anzahl der elektrischen Zuleitungen reduziert werden kann. Damit ergibt sich eine einfachere und kostengünstigere Herstellung. Gleichzeitig wird durch die zweite Kontaktierung in der brennraumseitigen Spitze der keramischen Heizvorrichtung sichergestellt, daß der Stromfluß über diese brennraum- seitige Spitze erfolgt und somit eine gute Gemischzugäng- lichkeit und damit Erwärmung des Kraftstoffgemisches gegeben ist. Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Hauptanspruch angegebenen Glühstiftkerze möglich. Besonders vorteilhaft ist, daß die elektrische Zuleitung an die Spitze des keramischen Heizelementes nicht aus einer flexiblen elektrischen Leitung besteht, sondern daß der Anschlußbol¬ zen, welcher außerhalb des Brennraums mit der Versorgungs- spannung, wie der Batterie des Kraftfahrzeuges, verbunden ist, direkt auf eine zentrale Zuleitung des Heizelementes oder mit dem verschlossenen Boden des keramischen Heizele¬ mentes verbunden ist. Damit kann ein Arbeitsschritt für das Anbringen des Zuleitungsdrahtes eingespart werden, indem einfach der Anschlußbolzen verlängert wird. Für die Herstel¬ lung der Glühstiftkerze hat dies den Vorteil, daß weniger Einzelteile bei der Montage zu handeln sind.The glow plug according to the invention with the characterizing features of the main claim has the advantage that the number of electrical leads can be reduced by ground contact of the ceramic Heizab¬ section over the cylindrical metal tube. This results in a simpler and cheaper production. At the same time, the second contacting in the tip of the ceramic heating device on the combustion chamber side ensures that the current flows through this tip on the combustion chamber side, thus ensuring good mixture access and thus heating of the fuel mixture. The measures listed in the subclaims allow advantageous developments and improvements of the glow plug specified in the main claim. It is particularly advantageous that the electrical supply line to the tip of the ceramic heating element does not consist of a flexible electrical line, but that the connecting bolt, which is connected outside the combustion chamber to the supply voltage, such as the battery of the motor vehicle, directly on a central supply line of the heating element or is connected to the closed bottom of the ceramic heating element. This saves one step for attaching the lead wire by simply extending the connector bolt. For the manufacture of the glow plug, this has the advantage that fewer individual parts have to be handled during assembly.
Zeichnungdrawing
Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher er¬ läutert. Es zeigen Figur 1 ein erstes Ausführungsbeispiel der Erfindung, Figur 2 ein zweites Ausführungsbeispiel der Erfindung, Figur 3 ein drittes Ausführungsbeispiel mit der Kontaktierung über den Anschlußbolzen, Figur 4 ein viertes Ausführungsbeispiel der Erfindung mit Kontaktierung des An¬ schlußbolzens und Figur 5 ein fünftes Ausführungsbeispiel der Erfindung mit einer Regelwende innerhalb der keramischen HeizVorrichtung.Exemplary embodiments of the invention are shown in the drawing and explained in more detail in the following description. FIG. 1 shows a first exemplary embodiment of the invention, FIG. 2 shows a second exemplary embodiment of the invention, FIG. 3 shows a third exemplary embodiment with contacting via the connecting bolt, FIG. 4 shows a fourth exemplary embodiment of the invention with contacting of the connecting bolt, and FIG. 5 shows a fifth exemplary embodiment of the Invention with a change of control within the ceramic heater.
Beschreibung der AusführungsbeispieleDescription of the embodiments
Figur 1 zeigt einen Längsschnitt durch eine erste Aus¬ führungsform der Erfindung. Die Glühstiftkerze besteht hier¬ bei aus einem zylindrischen Metallrohr 1. Dieses zylindri¬ sche Metallrohr 1 stellt das Gehäuse der Glühkerze dar und dient durch ein auf der Außenseite angebrachtes Gewinde 2 zum Einschrauben in den Motorblock. Das zylindrische Metall- röhr dient gleichzeitig als Halter für den Glühstift 3, wel¬ cher in den Brennraum hineinragt und während des Glühvor¬ gangs das Kraftstoffgemisch für eine schnellere Selbstent¬ zündung erwärmt. In eine Spitze des zylindrischen Metall- rohrs 1 ist somit eine keramische Heizvorrichtung 4 einge¬ bracht. Mittels des Gewindes 2 wird das Gehäuse 1 so in den nicht dargestellten Motorblock einer Brennkraftmaschine ein¬ geschraubt, daß das Ende der keramischen Heizvorrichtung 4 in einem freitragenden Zustand in eine Verbrennungskammer der Brennkraftmaschine hineinragt. Die keramische Heizvor¬ richtung 4 besteht aus einer elektrisch leitfähigen Keramik, die die Form einer an einer Seite verschlossenen Hülse auf¬ weist. Dabei ist die halterferne Seite der Hülse am Boden verschlossen. Die keramische Heizvorrichtung 4 ist in das Gehäuse 1 derart eingepaßt, daß eine elektrische Verbindung zwischen der äußeren Mantelfläche der keramischen Heizvor¬ richtung 4 und der Innenwand des zylindrischen Metallrohrs 1 entsteht. Auf der rückwärtigen Seite des zylindrischen Me¬ tallrohrs 1 ragt ein Anschlußbolzen 5 in das zylindrische Metallrohr hinein. Dieser Anschlußbolzen 5 ist mittels eines Isolierrings 6 gegen das zylindrische Metallrohr 1 elek¬ trisch isoliert. Auf der aus dem zylindrischen Metallrohr 1 herausragenden Seite wird der Anschlußbolzen 5 mit der Ver¬ sorgungsspannung beispielsweise der nicht dargestellten Bat¬ terie eines Kraftfahrzeuges kontaktiert. Am Ende des An¬ schlußbolzens 5, welches in das zylindrischen Metallrohr hineinragt ist eine elektrische Zuleitung 7 kontaktiert, die an den verschlossenen Boden 8 der hulsenformigen keramischen Heizvorrichtung 4 geführt ist. Damit ist der verschlossene Boden 8 der keramischen Heizvorrichtung mit positiver Ver¬ sorgungsspannung verbunden, so daß der Stromfluß von dem Boden der Heizvorrichtung aus über die Wandung der kerami¬ schen HeizVorrichtung bis zum Gehäuse 1 und damit nach Masse erfolgt. Figur 2 zeigt ein zweites Ausführungsbeispiel. Die Glüh¬ stiftkerze der Figur 2 entspricht in ihrem prinzipiellen Aufbau der konstruktiven Gestaltung der Figur 1, weshalb die einzelnen Details mit gleichen Bezugszeichen versehen sind und der gleiche Aufbau für gleiche Teile nicht nochmals er¬ läutert werden soll. Im Unterschied zu Figur 1 ist bei der Figur 2 die keramische HeizVorrichtung derart ausgebildet, daß die keramische Heizvorrichtung 3 hierbei eine Stabform, welche eine kreisringförmige Ausnehmung 10 hat, so daß die keramische Heizvorrichtung einen konzentrischen Kern 9 auf¬ weist. Die rotationssymmetrischen Längsachsen der stabför- migen keramischen Heizvorrichtung, der kreisringförmigen Ausnehmung und des konzentrischen Kerns sind dabei deckungs¬ gleich. Die kreisringförmige Ausnehmung 8 erstreckt sich über die gesamte Länge der keramischen Heizvorrichtung in der Art, daß die keramische Heizvorrichtung 3 an der Brenn¬ raumseite einen geschlossenen Boden aufweist. Der konzen¬ trische Kern 9 erstreckt sich ebenfalls über die gesamte Länge der keramischen Heizvorrichtung 3, so daß der am An¬ schlußbolzen 5 kontaktierte elektrische Draht 7 im Gegensatz zur Figur 1 nur bis an den konzentrischen Kern 9 heran¬ reicht. Damit ist die Zuleitung 7 wesentlich kürzer als bei¬ spielsweise die Zuleitung in der Figur 1, wodurch eine ge¬ ringere Belastung des sehr dünnen Zuleitungsdrahtes gegeben ist. Der Hohlraum im zylindrischen Metallrohr 1 kann wahl¬ weise mit einem elektrisch isolierenden keramischen Pulver gefüllt sein.FIG. 1 shows a longitudinal section through a first embodiment of the invention. The glow plug here consists of a cylindrical metal tube 1. This cylindrical metal tube 1 represents the housing of the glow plug and serves for screwing into the engine block by means of a thread 2 on the outside. The cylindrical metal tube also serves as a holder for the glow plug 3, which protrudes into the combustion chamber and heats the fuel mixture for faster self-ignition during the glow process. A ceramic heating device 4 is thus introduced into a tip of the cylindrical metal tube 1. By means of the thread 2, the housing 1 is screwed into the engine block (not shown) of an internal combustion engine such that the end of the ceramic heating device 4 projects into a combustion chamber of the internal combustion engine in a self-supporting state. The ceramic heater 4 consists of an electrically conductive ceramic, which has the shape of a sleeve closed on one side. The side of the sleeve remote from the holder is closed on the bottom. The ceramic heating device 4 is fitted into the housing 1 in such a way that an electrical connection is established between the outer lateral surface of the ceramic heating device 4 and the inner wall of the cylindrical metal tube 1. On the rear side of the cylindrical metal tube 1, a connecting bolt 5 projects into the cylindrical metal tube. This connecting pin 5 is electrically isolated from the cylindrical metal tube 1 by means of an insulating ring 6. On the side protruding from the cylindrical metal tube 1, the connecting bolt 5 is contacted with the supply voltage, for example of the battery, not shown, of a motor vehicle. At the end of the connecting bolt 5, which projects into the cylindrical metal tube, an electrical feed line 7 is contacted, which is led to the closed bottom 8 of the sleeve-shaped ceramic heating device 4. The closed bottom 8 of the ceramic heating device is connected to positive supply voltage so that the current flows from the bottom of the heating device over the wall of the ceramic heating device to the housing 1 and thus to ground. Figure 2 shows a second embodiment. The basic structure of the glow plug of FIG. 2 corresponds to the structural design of FIG. 1, which is why the individual details are provided with the same reference numerals and the same structure for the same parts is not to be explained again. In contrast to FIG. 1, the ceramic heating device in FIG. 2 is designed in such a way that the ceramic heating device 3 has a rod shape which has an annular recess 10, so that the ceramic heating device has a concentric core 9. The rotationally symmetrical longitudinal axes of the rod-shaped ceramic heating device, the annular recess and the concentric core are congruent. The annular recess 8 extends over the entire length of the ceramic heating device in such a way that the ceramic heating device 3 has a closed bottom on the combustion chamber side. The concentric core 9 also extends over the entire length of the ceramic heating device 3, so that, in contrast to FIG. 1, the electrical wire 7 contacted on the connecting bolt 5 only reaches up to the concentric core 9. The feed line 7 is thus considerably shorter than, for example, the feed line in FIG. 1, which results in a lower load on the very thin feed wire. The cavity in the cylindrical metal tube 1 can optionally be filled with an electrically insulating ceramic powder.
Auch bei dieser Figur 2 ist der Heizstift an seiner vom zylindrischen Metallrohr umgebenen Umfangsflache in das Ge¬ häuse eingelötet und so gleichzeitig die Verbindung zur Masse hergestellt. Bei dieser Ausgestaltungsform ist eben¬ falls ein Stromfluß von der brennraumseitigen Spitze der keramischen Heizvorrichtung 3 über die Umfangsflache der keramischen Heizvorrichtung an Masse gegeben. Die Figur 3 zeigt ein Ausführungsbeispiel, welches im wesentlichen der Figur 2 entspricht. Der einzige Unterschied zur Figur 2 besteht darin, daß der Anschlußbolzen 5 direkt bis an den konzentrischen Kern 9 der keramischen Heizvor¬ richtung 3 herangeführt ist. Bei dieser Ausgestaltungsform entfällt der elektrische Zuleitungsdraht ganz.In this FIG. 2 too, the heating pin is soldered into the housing on its circumferential surface surrounded by the cylindrical metal tube, and thus the connection to ground is made at the same time. In this embodiment, there is also a current flow from the tip of the ceramic heating device 3 on the combustion chamber side over the circumferential surface of the ceramic heating device to ground. FIG. 3 shows an exemplary embodiment which essentially corresponds to FIG. 2. The only difference from FIG. 2 is that the connecting bolt 5 is brought right up to the concentric core 9 of the ceramic heating device 3. In this embodiment, the electrical lead wire is completely eliminated.
Figur 4 zeigt eine vierte Ausgestaltungsform, die im wesent¬ lichen dem Ausführungsbeispiel in Figur 3 entspricht. Der einzige Unterschied besteht darin, daß der Anschlußbolzen 5 hier in Anlehnung an die Figur 3 so weit verlängert ist, daß er bis zum verschlossenen Boden der keramischen Heizvorrich¬ tung 3 reicht.FIG. 4 shows a fourth embodiment which essentially corresponds to the exemplary embodiment in FIG. 3. The only difference is that the connecting bolt 5 is extended here, based on FIG. 3, to such an extent that it extends to the closed bottom of the ceramic heating device 3.
Wesentlich ist für alle Ausführungsbeispiele, daß der Strom durch die halterferne Spitze der keramischen Heizvorrichtung 3 fließt. Zu diesem Zweck ist die Kontaktierung mit dem po¬ sitiven Pol der Versorgungsspannung über den Anschlußbolzen und wahlweise einer elektrischen Zuleitung an dem verschlos¬ senen Boden der keramischen Heizvorrichtung vorgesehen. Da die keramische Heizvorrichtung an ihrer vom Halter umgebenen Umfangsflache mit Masse elektrisch kontaktiert ist, ist so gewährleistet, daß der Stromfluß sich in jedem Fall von der Spitze des keramischen Heizelementes 3 über die Umfangs- flache der keramischen Heizvorrichtung erstreckt. Damit ist gewährleistet, daß die in den Brennraum am weitesten hinein¬ ragende Spitze der keramischen HeizVorrichtung glüht und das Dieselgemisch erwärmt wird. It is essential for all exemplary embodiments that the current flows through the tip of the ceramic heating device 3 remote from the holder. For this purpose, contact is made with the positive pole of the supply voltage via the connecting bolts and optionally an electrical supply line on the closed bottom of the ceramic heating device. Since the ceramic heating device is electrically contacted on its peripheral surface surrounded by the holder, this ensures that the current flow in any case extends from the tip of the ceramic heating element 3 over the peripheral surface of the ceramic heating device. This ensures that the tip of the ceramic heating device which projects furthest into the combustion chamber glows and the diesel mixture is heated.

Claims

Ansprüche Expectations
1. Glühkerze für Dieselmotoren mit einem zylindrischen Me¬ tallrohr, einer keramischen Heizvorrichtung, die mit einem freitragend zur Außenseite führenden Ende von der Spitze des zylindrischen Metallrohrs gehalten wird, mit einem elek¬ trisch leitenden Anschlußbolzen, welcher mit der Versor¬ gungsspannung verbunden ist und auf der der keramischen Heizvorrichtung gegenüberliegenden Seite des zylindrischen Metallrohrs in das zylindrische Metallrohr hineinragt und gegen das zylindrische Metallrohr elektrisch isoliert ist, dadurch gekennzeichnet, daß die keramische Heizvorrichtung eine hülsenförmige elektrisch leitende Keramik ist, die einerseits an ihrem vom zylindrischen Metallrohr umgebenen Rand mit dem zylindrischen Metallrohr und andererseits an ihrem vom zylindrischen Metallrohr entfernt liegenden ver¬ schlossenem Boden mit dem Anschlußbolzen elektrisch leitend verbunden ist.1. Glow plug for diesel engines with a cylindrical metal tube, a ceramic heating device which is held with a self-supporting end leading to the outside from the tip of the cylindrical metal tube, with an electrically conductive connecting bolt which is connected to the supply voltage and protrudes into the cylindrical metal tube on the side of the cylindrical metal tube opposite the ceramic heating device and is electrically insulated from the cylindrical metal tube, characterized in that the ceramic heating device is a sleeve-shaped, electrically conductive ceramic which, on the one hand, has the cylindrical one on its edge surrounded by the cylindrical metal tube Metal pipe and, on the other hand, is electrically conductively connected to the connecting bolt at its closed bottom, which is remote from the cylindrical metal pipe.
2. Glühkerze nach Anspruch 1, dadurch gekennzeichnet, daß die elektrische Verbindung zwischen Anschlußbolzen und ver¬ schlossenem Boden der keramischen Heizvorrichtung ein elek¬ trisch leitfähiger Draht ist.2. Glow plug according to claim 1, characterized in that the electrical connection between the connecting bolt and the closed bottom of the ceramic heating device is an electrically conductive wire.
3. Glühkerze nach Anspruch 1, dadurch gekennzeichnet, daß der Anschlußbolzen 5 direkt mit der elektrischen Heizvor¬ richtung kontaktiert ist.3. Glow plug according to claim 1, characterized in that the connecting bolt 5 is contacted directly with the electrical Heizvor¬ direction.
4. Glühkerze nach Anspruch 3, dadurch gekennzeichnet, daß der Anschlußbolzen mit dem Boden der keramischen Heizvor¬ richtung kontaktiert ist. 4. Glow plug according to claim 3, characterized in that the connecting bolt is contacted with the bottom of the ceramic Heizvor¬ direction.
PCT/DE1996/000144 1995-02-28 1996-02-01 Pencil type glow plug for diesel engines WO1996027105A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19506947.1 1995-02-28
DE1995106947 DE19506947A1 (en) 1995-02-28 1995-02-28 Glow plug for diesel engines

Publications (1)

Publication Number Publication Date
WO1996027105A1 true WO1996027105A1 (en) 1996-09-06

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4437440A (en) * 1979-06-20 1984-03-20 Ngk Spark Plug Co., Ltd. Auxiliary combustion chamber preheating device
US4475030A (en) * 1981-09-25 1984-10-02 Caterpillar Tractor Co. Glow plug having resiliently mounted ceramic surface-ignition element
JPS61217624A (en) * 1985-03-22 1986-09-27 Jidosha Kiki Co Ltd Self-temperature control type glow plug
DE3621216A1 (en) * 1985-06-27 1987-02-05 Jidosha Kiki Co GLOW PLUG FOR DIESEL MACHINES
US5304778A (en) * 1992-11-23 1994-04-19 Electrofuel Manufacturing Co. Glow plug with improved composite sintered silicon nitride ceramic heater

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4437440A (en) * 1979-06-20 1984-03-20 Ngk Spark Plug Co., Ltd. Auxiliary combustion chamber preheating device
US4475030A (en) * 1981-09-25 1984-10-02 Caterpillar Tractor Co. Glow plug having resiliently mounted ceramic surface-ignition element
JPS61217624A (en) * 1985-03-22 1986-09-27 Jidosha Kiki Co Ltd Self-temperature control type glow plug
DE3621216A1 (en) * 1985-06-27 1987-02-05 Jidosha Kiki Co GLOW PLUG FOR DIESEL MACHINES
US5304778A (en) * 1992-11-23 1994-04-19 Electrofuel Manufacturing Co. Glow plug with improved composite sintered silicon nitride ceramic heater

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 11, no. 57 (M - 564) 21 February 1987 (1987-02-21) *

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